What is the common cause of the "Failed to connect to mailserver" error when using the mail() function in PHP?

The common cause of the "Failed to connect to mailserver" error when using the mail() function in PHP is incorrect mail server settings or network connectivity issues. To solve this issue, ensure that the correct SMTP server, port, username, and password are provided in the PHP mail() function. Additionally, check for any firewall restrictions that may be blocking the connection to the mail server. 

// Example PHP code snippet to set up mail server settings for the mail() function
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com";

ini_set("SMTP", "mail.example.com");
ini_set("smtp_port", "25");
ini_set("sendmail_from", "sender@example.com");

// Send email
if (mail($to, $subject, $message, $headers)) {
    echo "Email sent successfully";
} else {
    echo "Failed to send email";
}

Keywords

mail() mailserver connection error PHP

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